register_theme_directory somehow “fails” when folder is outside of WP-Folder

While I cannot speak to your specific white-screen issue, registered theme directories must be within the Apache document root, at minimum.

Many files in themes, such as CSS, JS, images, etc, are served directly by the webserver, not via calls to WordPress. So having a theme directory that is not directly accessible and serve-able by the webserver process clearly will not work.

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